Among almost 200 endocytobiotic associations between freshwater ciliates and Chlorella‐like algae (A) one Euplotes species—E. daidaleos Diller, Kounaris, 1966 is existing. It was not so far under particular investigation. Comparative study of cell morphology and behavior of “green” and derived from it “white” stocks of the ciliate (C), collected in Italy and Russia were carried out, using light and electron microscopy. The green C usually maintain 30–80 units of A and some bacteria (B), belonging to the different types—Polynucleobacter‐like bacterium, β‐subgroup of Proteobacteria (size about 2−10 × 0.4−0.5 μm) and another eubacterium (size 1−2 × 0.6−0.8 μm). The number of the first B was much higher in the white C, but could vary between different host cells. According to data obtained with fluorescent microscopy it looks like these B can produce long chains, which consisted of quite short individuals with only one nucleoid. Association between Euplotes and Chlorella within the system is rather a close one: loss of the A after long time cultivation of C in darkness usually did not happen. The majority of the ciliates (96–100%) kept A, but this number often dropped down, apparently
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